How do people get stable 8000 MT/s?

[noname8365]

Give me a quick rundown on the absolute necessities.

[Levent]

Luck.

[YoungBlade]

Either by winning the silicon lottery for their CPU integrated memory controller (IMC) and/or RAM, or doing some dubious tweaks, like running the CPU in a lower gear or at a lower fabric speed (depending on Intel or AMD) so that the RAM can run at DDR5-8000, but the CPU's IMC is running slower.

 

This latter method is not recommended, as the resulting performance will usually be lower in spite of the higher memory speed. Unless you know for sure that your particular use case benefits strongly from memory bandwidth alone and doesn't care about memory latency (which is rare) you should not slow down the IMC to run faster RAM.

[WereCat]

Good motherboard for memory OC with solid BIOS, luck with integrated memory controller quality on the CPU, Hynix rev. A memory ICs and active cooling for DRAM... And knowledge of memory overclocking 

[RONOTHAN##]

Luck and/or days of tweaking different voltages and termination settings. Unless you're on a board like an Apex or Tachyon, it's usually a lost cause. 

 

21 minutes ago, YoungBlade said:

doing some dubious tweaks, like running the CPU in a lower gear or at a lower fabric speed (depending on Intel or AMD) so that the RAM can run at DDR5-8000, but the CPU's IMC is running slower.

On Intel, going to Gear 4 doesn't even get DDR5 8000 stable if Gear 2 doesn't work (ask me how I know). On AMD though, DDR5 8000 is able to overcome the 2:1 IMC mode performance penalty for latency, so it is just overall faster than DDR5 6000 CL30, but it's also incredibly hard to stabilize and subject to the silicon lottery just as much as it is on Intel. 

[PDifolco]

23 minutes ago, RONOTHAN## said:

Luck and/or days of tweaking different voltages and termination settings. Unless you're on a board like an Apex or Tachyon, it's usually a lost cause. 

 

On Intel, going to Gear 4 doesn't even get DDR5 8000 stable if Gear 2 doesn't work (ask me how I know). On AMD though, DDR5 8000 is able to overcome the 2:1 IMC mode performance penalty for latency, so it is just overall faster than DDR5 6000 CL30, but it's also incredibly hard to stabilize and subject to the silicon lottery just as much as it is on Intel. 

Yeah, looking at my upcoming 7800X3D or 8800X3D build and overall from what I'v seen there seems to be really not much point trying to get above 6000CL30 or at best 6400CL32 Gear1 on AM5